Design for a pneumatic coupling device



FIG. 1 is a perspective view of a pneumatic coupling device, showing my new design;

FIG. 2 is a perspective view thereof, seen from the opposite side of FIG. 1;

FIG. 3 is a side elevational view thereof; the opposite side thereof is identical thereto;

FIG. 4 is a side elevational view thereof, rotated 90° compared to FIG. 3; the opposite side thereof is identical thereto;

FIG. 5 is an end view thereof; and,

FIG. 6 is an end view shown from the opposite side of FIG. 5. 

The ornamental design for a pneumatic coupling device, as shown and described. 